MRI apparatus and RF pulse generating circuit
First Claim
1. An MRI apparatus comprising:
- an RF coil to which analog RF pulse signals are applied;
an RF pulse generating circuit configured to generate the analog RF pulse signals; and
a magnetic resonance signal receiving circuit configured to receive analog magnetic resonance signals and to convert the analog magnetic resonance signals into baseband digital magnetic resonance signals,wherein said RF pulse generating circuit comprises;
a carrier signal generator configured to generate a digital carrier signal having a predetermined number of bits;
a digital modulator configured to modulate the digital carrier signal with a digital envelope signal to generate digital RF pulse signals;
a digital-analog converter configured to generate the digital RF pulse signals into the analog RF pulse signals; and
an inversion unit configured to generate a digital inverted carrier signal having a two'"'"'s complement relationship with the digital carrier signal and to send the digital inverted carrier signal to said magnetic resonance signal receiving circuit,and wherein said magnetic resonance signal receiving circuit comprises;
an analog-digital converter configured to convert the analog magnetic resonance signals into digital magnetic resonance signals having a predetermined number of bits; and
a digital demodulator configured to demodulate the digital magnetic resonance signals with the digital inverted carrier signal to convert the digital magnetic resonance signals into the baseband digital magnetic resonance signals.
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0 Petitions
Accused Products
Abstract
An MRI apparatus includes: an RF coil to which analog RF pulse signals are applied; an RF pulse generating circuit which generates said analog RF pulse signals; and a magnetic resonance signal receiving circuit which receives analog magnetic resonance signals and converts these signals into baseband digital magnetic resonance signals, said RF pulse generating circuit comprising: a carrier signal generator which generates a digital carrier signal having a predetermined number of bits; a digital modulator which modulates said digital carrier signal with a digital envelope signal, thus generating digital RF pulse signals; a digital-analog converter which converts said digital RF pulse signals into the analog RF pulse signals; and an inversion unit which generates a digital inverted carrier signal having a two'"'"'s complement relationship with said digital carrier signal and sends the digital inverted carrier signal to said magnetic resonance signal receiving circuit, said magnetic resonance signal receiving circuit comprising: an analog-digital converter which converts the analog magnetic resonance signals into digital magnetic resonance signals having a predetermined number of bits; and a digital demodulator which demodulates said digital magnetic resonance signals with said digital inverted carrier signal, thus converting these signals into the baseband digital magnetic resonance signals.
22 Citations
20 Claims
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1. An MRI apparatus comprising:
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an RF coil to which analog RF pulse signals are applied; an RF pulse generating circuit configured to generate the analog RF pulse signals; and a magnetic resonance signal receiving circuit configured to receive analog magnetic resonance signals and to convert the analog magnetic resonance signals into baseband digital magnetic resonance signals, wherein said RF pulse generating circuit comprises; a carrier signal generator configured to generate a digital carrier signal having a predetermined number of bits; a digital modulator configured to modulate the digital carrier signal with a digital envelope signal to generate digital RF pulse signals; a digital-analog converter configured to generate the digital RF pulse signals into the analog RF pulse signals; and an inversion unit configured to generate a digital inverted carrier signal having a two'"'"'s complement relationship with the digital carrier signal and to send the digital inverted carrier signal to said magnetic resonance signal receiving circuit, and wherein said magnetic resonance signal receiving circuit comprises; an analog-digital converter configured to convert the analog magnetic resonance signals into digital magnetic resonance signals having a predetermined number of bits; and a digital demodulator configured to demodulate the digital magnetic resonance signals with the digital inverted carrier signal to convert the digital magnetic resonance signals into the baseband digital magnetic resonance signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An RF pulse generating circuit for use in an MRI apparatus including a magnetic resonance signal receiving circuit configured to demodulate digital magnetic resonance signals having a predetermined number of bits with a digital inverted carrier signal to convert the digital magnetic resonance signals into baseband digital magnetic resonance signals, said RF pulse generating circuit comprising:
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a carrier signal generator configured to generate a digital carrier signal having a predetermined number of bits; a digital modulator configured to modulate the digital carrier signal with a digital envelope signal to generate digital RF pulse signals; a digital-analog converter configured to convert the digital RF pulse signals into analog RF pulse signals; and an inversion unit configured to generate a digital inverted carrier signal having a two'"'"'s complement relationship with the digital carrier signal and to send the digital inverted carrier signal to said magnetic resonance signal receiving circuit. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification